Referred to by the Scots as the Merry Dancers, the Aurora Borealis have caught the imagination of people acrossthe globe.Dr Chris Lintott travels to a radar facility in northern Norway to discover how these magical lights are created,while Sir Patrick Moore discusses how our sun calls the tune for the Merry Dancers.Also, the latest news from Mars, where methane has been shown to be localized, meaning there must be asource for it. One possible source of methane are bacteria... And the Milky Way is shown to be bigger thanpreviously thought, which will make the collission with the Andromeda Galaxy all the more likely.